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[189]81      <h1 class="directory"><a href="directory-overview.html">Interpolation/</a></h1>
[112]82      <h2 class="pro_file">compute_fromirr_bilinear_weigaddr.pro</h2>
83
84      <div id="file_attr">
85        <dl>
86        </dl>
87      </div>
88
[138]89      <div id="file_comments">
90 compute the weight and address needed to interpolate data from
91 an "irregular 2D grid" (defined as a grid made of quadrilateral cells)
92 to any grid using the bilinear method
93</div>
[112]94
95     
96
97     
98
99     
100
101     
102
103      <div id="routine_details">
104       
105
106        <div class="routine_details" id="_compute_fromirr_bilinear_weigaddr">
107
[234]108          <h2><a class="top" href="#container">top</a>compute_fromirr_bilinear_weigaddr <span class="categories">
[157]109 Interpolation
[112]110</span></h2>
111       
112          <p class="header">
113            compute_fromirr_bilinear_weigaddr<span class="result">, <a href="#_compute_fromirr_bilinear_weigaddr_param_olonin">olonin</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_olat">olat</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_omsk">omsk</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_alonin">alonin</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_alat">alat</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_amsk">amsk</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_weig">weig</a>, <a href="#_compute_fromirr_bilinear_weigaddr_param_addr">addr</a></span></p>
114       
[234]115          <div class="comments">
116</div>
[112]117
[118]118         
[112]119
120         
121            <h3>Parameters</h3>
122       
123           
124            <h4 id="_compute_fromirr_bilinear_weigaddr_param_olonin">olonin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
125              <span class="attr">in</span>
126             
127             
128              <span class="attr">required</span>
129             
[203]130              <span class="attr">type:</span> <span class="value">2d array</span>
[112]131             
132             
133            </h4>
134       
[138]135          <div class="comments">
136 longitude of the input data
137</div>
[112]138           
139            <h4 id="_compute_fromirr_bilinear_weigaddr_param_olat">olat&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
140              <span class="attr">in</span>
141             
142             
143              <span class="attr">required</span>
144             
[203]145              <span class="attr">type:</span> <span class="value">2d array</span>
[112]146             
147             
148            </h4>
149       
[138]150          <div class="comments">
151 latitude of the input data
152</div>
[112]153           
154            <h4 id="_compute_fromirr_bilinear_weigaddr_param_omsk">omsk&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
155              <span class="attr">in</span>
156             
157             
158              <span class="attr">required</span>
159             
[203]160              <span class="attr">type:</span> <span class="value">2d array or -1</span>
[112]161             
162             
163            </h4>
164       
[138]165          <div class="comments">
166 land/sea mask of the input data
[203]167 put -1 if input data are not masked
[138]168</div>
[112]169           
170            <h4 id="_compute_fromirr_bilinear_weigaddr_param_alonin">alonin&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
171              <span class="attr">in</span>
172             
173             
174              <span class="attr">required</span>
175             
[203]176              <span class="attr">type:</span> <span class="value">2d array</span>
[112]177             
178             
179            </h4>
180       
[138]181          <div class="comments">
182 longitude of the output data
183</div>
[112]184           
185            <h4 id="_compute_fromirr_bilinear_weigaddr_param_alat">alat&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
186              <span class="attr">in</span>
187             
188             
189              <span class="attr">required</span>
190             
[203]191              <span class="attr">type:</span> <span class="value">2d array</span>
[112]192             
193             
194            </h4>
195       
[138]196          <div class="comments">
197 latitude of the output data
198</div>
[112]199           
200            <h4 id="_compute_fromirr_bilinear_weigaddr_param_amsk">amsk&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
201              <span class="attr">in</span>
202             
203             
204              <span class="attr">required</span>
205             
[203]206              <span class="attr">type:</span> <span class="value">2d array or -1</span>
[112]207             
208             
209            </h4>
210       
[138]211          <div class="comments">
212 land/sea mask of the output data
[203]213 put -1 if output data are not masked
[112]214</div>
215           
216            <h4 id="_compute_fromirr_bilinear_weigaddr_param_weig">weig&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
217             
[118]218              <span class="attr">out</span>
[112]219             
220             
221             
[203]222              <span class="attr">type:</span> <span class="value">2d array</span>
[112]223             
224             
225            </h4>
226       
[203]227          <div class="comments">
228 (see ADDR)
229</div>
[112]230           
231            <h4 id="_compute_fromirr_bilinear_weigaddr_param_addr">addr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
232             
[118]233              <span class="attr">out</span>
[112]234             
235             
236             
[203]237              <span class="attr">type:</span> <span class="value">2d array</span>
[112]238             
239             
240            </h4>
241       
[118]242          <div class="comments">
243 2D arrays, weig and addr are the weight and addresses used to
244 perform the interpolation:
245  dataout = total(weig*datain[addr], 1)
246  dataout = reform(dataout, jpia, jpja, /over)
247</div>
[112]248           
249
250         
251
252         
253
254         
255          <h3>Version history</h3>
256         
[234]257          <h4>Version</h4><div class="preformat">
[402]258 $Id: compute_fromirr_bilinear_weigaddr.pro 372 2008-08-08 12:31:53Z pinsard $
[118]259</div>
[138]260          <h4>History</h4><div class="preformat">
[402]261 June 2006: Sebastien Masson (smasson@lodyc.jussieu.fr)
[118]262</div>
[112]263         
264         
265          <h3>Known issues</h3>
266         
267         
268         
[138]269          <h4>Restrictions</h4><div class="preformat">
270  -  the input grid must be an "irregular 2D grid", defined as a grid made
[290]271  of quadrilateral cells
[112]272  -  We supposed the data are located on a sphere, with a periodicity along
[138]273  the longitude
[112]274  -  to perform the bilinear interpolation within quadrilateral cells, we
[138]275  first morph the cell into a square cell and then compute the bilinear
276  interpolation.
[321]277  -  if some corners of the cell are land points, their weights are set to 0
[138]278  and the weight is redistributed on the remaining "water" corners
[112]279  -  points located out of the southern and northern boundaries or in cells
[321]280  containing only land points are set the same value as their closest neighbors
[138]281</div>
[112]282       
283         
284         
285         
286         
287         
288         
289         
290       
[163]291          <h3>Statistics</h3>
292          <table class="statistics">
[321]293            <tr><td>McCabe cyclic</td><td>          49</td></tr>
[163]294            <tr><td>McCabe essential</td><td>           1</td></tr>
295            <tr><td>McCabe modular design</td><td>           1</td></tr>
296          </table>
[112]297         
298       
299        </div>
300       
301      </div>
302
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304
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